Editing Screamer (section)

==Systematics and evolution==
Anhimids are most similar to [[Presbyornithidae|presbyornithid]]s, with which they may form a clade to the exclusion of the rest of Anseriformes. Given the presence of lamelae in the otherwise fowl-like beaks of screamers, it is even possible that they evolved from [[Presbyornithidae|presbyornithid-grade]] birds, reverting from a filter-feeding lifestyle to an herbivorous one.<ref name=dePietri-Schofield-etal-2016/>

Screamers have a poor fossil record. ''[[Anachronornis]]'' from the [[Eocene]] of [[Wyoming]] was originally suggested to be a screamer but is now though to be a basal [[Anseriformes|anseriform]], while the more modern ''[[Chaunoides antiquus]]'' is known from the late [[Oligocene]] to early [[Miocene]] in [[Brazil]]. ''[[Eoneornis]]'' from the Miocene of Argentina was originally described as an indeterminate anseriform but shows some similarities with Anhimidae, especially ''Chaunoides''.<ref>{{cite journal |last1=Cenizo|first1=M.M. |last2=Agnolín|first2=F.L.|year=2010|title=The southernmost records of Anhingidae and a new basal species of Anatidae (Aves) from the lower–middle Miocene of Patagonia, Argentina|journal=Alcheringa |volume=34|issue=4|pages=493–514| url=https://www.tandfonline.com/doi/full/10.1080/03115511003793504| doi=10.1080/03115511003793504|url-access=subscription}}</ref>

{| class="wikitable"
|-
! Image !! Genus   !! Living Species
|-
|[[File:Anhima cornuta - Horned screamer.jpg|120px]]||''Anhima ''  || 
*  [[horned screamer]], (''Anhima cornuta'')
|-
|[[File:Southern Screamer RWD2.jpg|120px]]||''[[Chauna]]''  || 
* [[Southern screamer]] or crested screamer, ''Chauna torquata''
* [[Northern screamer]] or black-necked screamer, ''Chauna chavaria''
|-
|}